ka toa 0.109 m solution of a weak acid (ha) has a ph of 4.50. what is the pka of the acid? enter pka to 4 decimal places. pka

A. 80°C to 20°C - 16.9g KNO3 per 100g of water

B. 60°C to 40°C - 14.7g KNO3 per 100g of water.

C. 50°C to 30°C - 12.6g KNO3 per 100g of water

D. 80°C to 0°C - 32.2g KNO3 per 100g of water.

E. 50°C to 10°C - 21.9g KNO3 per 100g of water

The amount of potassium nitrate that can be crystallized from a saturated solution is dependent on the temperature. As the temperature decreases, the amount of KNO3 that can be crystallized increases.

When the temperature drops from 80°C to 20°C, 16.9g of KNO3 can be crystallized from a saturated solution per 100g of water. This is the lowest amount of KNO3 that can be crystallized from a saturated solution, as the temperature cannot be lower than this.

The amount of KNO3 increases as the temperature drops from 60°C to 40°C, with 14.7g of KNO3 crystallizing per 100g of water. This pattern continues, with 12.6g of KNO3 crystallizing from a saturated solution when the temperature drops from 50°C to 30°C.

When the temperature drops from 80°C to 0°C, the highest amount of KNO3 can be crystallized from a saturated solution, with 32.2

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The number of moles in 12.25 kg of ammonium chloride would be 229.02 moles.

To calculate the number of moles of ammonium chloride (NH4Cl) in 12.25 kg, we need to use the formula:

Number of moles = Mass / Molar mass

First, we need to calculate the molar mass of NH4Cl, which is the sum of the atomic masses of all the atoms in one mole of the compound:

Molar mass of NH4Cl = (1 x atomic mass of N) + (4 x atomic mass of H) + (1 x atomic mass of Cl)

= (1 x 14.01) + (4 x 1.01) + (1 x 35.45)

= 53.49 g/mol (rounded to two decimal places)

Now we can use the formula to calculate the number of moles:

Number of moles = Mass / Molar mass

= 12,250 g / 53.49 g/mol

= 229.02 mol (rounded to two decimal places)

Therefore, there are 229.02 moles of ammonium chloride in 12.25 kg of the compound.

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The molarity of a solution made from 2.63 moles of nacl dissolved in a total volume of 500.0 ml is 5.26 M.

Molarity is the concentration of a solution in terms of moles of solute per liter of solution. The formula for calculating the molarity of a solution is as follows:

Molarity = moles of solute / volume of solution (in liters)

Given,

Moles of solute (NaCl) = 2.63 mol

Total volume of the solution = 500.0 mL = 0.5 LA

substitute the given values in the formula,

Molarity = 2.63 / 0.5

Molarity = 5.26 M

The molarity of the solution made from 2.63 moles of NaCl dissolved in a total volume of 500.0 mL is 5.26 M.

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We need 5.62 moles of H2 and 5.62 moles of CO to produce 3.60 × 10^2 g of CH3OH.

How to calculate the mole ?

To calculate the number of moles of a substance, we use the formula:

moles = mass / molar mass

where "mass" is the mass of the substance in grams and "molar mass" is the molar mass of the substance in grams per mole.

To determine the number of moles of reactants needed to produce a given amount of product, we need to use the balanced chemical equation for the reaction and the molar mass of the product.

Assuming that the reaction is:

2H2 + CO → CH3OH

We can see that the stoichiometry of the reaction is 2:1, which means that for every 2 moles of H2, we need 1 mole of CO to produce 1 mole of CH3OH.

The molar mass of CH3OH is:

12.01 + 4(1.01) + 16.00 = 32.04 g/mol

Therefore, to produce 3.60 × 10^2 g of CH3OH, we need:

n(CH3OH) = (3.60 × 10^2 g) / (32.04 g/mol) = 11.23 mol

Since the stoichiometry of the reaction is 2:1, we need half as many moles of H2 as we do of CH3OH:

n(H2) = 1/2 × n(CH3OH) = 1/2 × 11.23 mol = 5.62 mol

And we need half as many moles of CO as we do of CH3OH:

n(CO) = 1/2 × n(CH3OH) = 1/2 × 11.23 mol = 5.62 mol

Therefore, we need 5.62 moles of H2 and 5.62 moles of CO to produce 3.60 × 10^2 g of CH3OH.

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One common reaction that produces carbon dioxide in organic chemistry workup is the reaction between sodium bicarbonate (NaHCO₃) and an acid.

When an acidic solution is added to a mixture containing sodium bicarbonate, carbon dioxide gas is produced as a result of the following reaction:

NaHCO₃ + H+ → Na+ + CO₂ + H₂O

The carbon dioxide gas will then bubble out of the mixture and can be collected in a separate container or released into the air.

In a separatory funnel workup, this reaction may be used to remove excess acid from an organic reaction mixture. The mixture is first extracted with a suitable organic solvent, and then an aqueous solution of sodium bicarbonate is added to the separatory funnel. The acidic components in the mixture will react with the sodium bicarbonate to produce carbon dioxide, which will bubble out of the mixture and can be released through the stopcock

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If the initial concentration of A is 0.0275 M and the rate constant has a value of 0.0082 s^-1, what is the concentration of A after 540.0 s? The rate of reaction can be expressed as follows: rate = -d[A]/dt = k [A]The integrated rate law for a first-order reaction is: ln [A]t/[A]0 = -kt Where [A]t is the concentration of the reactant at a particular time t.

[A]0 is the initial concentration of the reactant at t=0.k is the rate constant.t is the time of the reaction. As a result, we can rearrange the equation to find the concentration of the reactant at a specific time t as follows: ln[A]t = -kt + ln[A]0Given that the initial concentration of A is 0.0275 M,

the rate constant has a value of 0.0082 s^-1, and we want to find the concentration of A after 540.0 s.We will substitute the provided values into the equation as follows:

ln[A]t = -kt + ln[A]0ln[A]t = (-0.0082 s^-1) (540.0 s) + ln (0.0275 M)ln[A]t = -4.4358 + ln(0.0275)ln[A]t = -4.4358 - 3.5941ln[A]t = -8.0299[A]t = e^-8.0299[A]t = 0.000293 M Therefore, the concentration of A after 540.0 s is 0.000293 M.

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After 115.2 years starting with a 10 gram sample of strontium-90, only 0.625 grams of strontium-90 will remain due to radioactive decay.

Strontium-90 is a radioactive isotope that goes through dramatic rot with a half-existence of 28.8 years. This really intends that after each 28.8-year time frame, how much strontium-90 excess in an example is divided. To decide how much strontium-90 will be left after 115.2 years, we can utilize the accompanying recipe:

N = N0 * (1/2)^(t/T1/2)

where N is the last measure of strontium-90, N0 is the underlying sum, t is the time slipped by, and T1/2 is the half-life. Subbing the given qualities, we get:

N = 10 g * (1/2)^(115.2/28.8)

N = 10 g * (1/2)^4

N = 10 g * 0.0625

N = 0.625 g

In this manner, after 115.2 years, beginning with a 10 gram test of strontium-90, just 0.625 grams of strontium-90 will stay because of radioactive rot. This estimation shows that how much radioactive material declines over the long run, which is a significant thought in the protected dealing with and removal of radioactive materials.

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Answer:

H2, N2, O2, F2, Cl2

Explanation:

Answer: If a sample has 50 atoms of 87Rb and 50 atoms of Sr, it has gone through the equivalent of 77.7 billion years in half-lives.

In order to answer this question, we need to know the half-lives of both 87Rb and Sr. The half-life of 87Rb is 48.8 billion years and the half-life of Sr is 28.9 billion years.

Therefore, the sample has gone through the equivalent of (50/50) x 48.8 billion years, or 48.8 billion years, of 87Rb's half-life.

It has also gone through (50/50) x 28.9 billion years, or 28.9 billion years, of Sr's half-life. In total, the sample has gone through the equivalent of 77.7 billion years in half-lives.

In summary, if a sample has 50 atoms of 87Rb and 50 atoms of Sr, it has gone through the equivalent of 77.7 billion years in half-lives.


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I reckon is is the Prophase stage. My reason is that the difference between Interphase and Prophase is actually really obvious. In Interphase, the chromosomes aren't paired up, whereas in Prophase, the chromosomes are beginning to pair up.

Answer: Phase change from solid to gas will have a more dramatic increase in entropy.

This is because gas has the highest entropy of all phases. Gas has the highest entropy because its molecules are moving randomly, and it has the greatest amount of disorder. In addition, the transition from solid to gas involves both increasing temperature and changing the arrangement of particles from an ordered solid to a disordered gas. This results in a significant increase in entropy.

Phase transition refers to the process of changing from one phase of matter to another. When a substance changes from one phase to another, its entropy changes. Entropy refers to the degree of disorder or randomness in a system, and it is related to the number of ways that a system can be arranged. When the degree of disorder increases, the entropy also increases.

In summary, phase change from solid to gas has a more dramatic increase in entropy. This is because gas has the highest entropy of all phases, and the transition from solid to gas involves both increasing temperature and changing the arrangement of particles from an ordered solid to a disordered gas, resulting in a significant increase in entropy.



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By using the stoichiometric ratio of the equation 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O. when 84 moles of NH3 are consumed, 504 moles of H2O can be made.

Given the equation: 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O
If 84 moles of NH3 are consumed, then:
Step 1:

Calculate the number of moles of CuO required for the reaction.
Using the stoichiometric ratio of the equation, the number of moles of CuO required for the reaction is (2 x 84 moles NH3) = 168 moles CuO.
Step 2:

Calculate the number of moles of H2O formed.
Using the stoichiometric ratio of the equation, the number of moles of H2O formed in the reaction is (3 x 168 moles CuO) = 504 moles H2O.
Therefore, when 84 moles of NH3 are consumed, 504 moles of H2O can be made.

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The entropy of 1.00 moles of AgCl added to 1.00 L of water to form AgCl(aq) would be less than the entropy of 1.00 moles of NaCl added to 1.00 L of water to form NaCl(aq).

This is because AgCl is less soluble in water compared to NaCl, due to solubility rules. When NaCl dissolves in water, it forms more ions and increases entropy more significantly than AgCl does.

Entropy is a thermodynamic quantity that describes the degree of disorder or randomness in a system. When a substance dissolves in a solvent, the entropy of the system increases due to the increased disorder caused by the mixing of the two substances.

In the given scenario, 1.00 moles of AgCl is added to 1.00 L of water to form AgCl(aq), and 1.00 moles of NaCl is added to 1.00 L of water to form NaCl(aq).

Since NaCl is more soluble in water compared to AgCl, it forms more ions when it dissolves in water, resulting in a greater increase in disorder and hence a greater increase in entropy.

Solubility rules state that AgCl is insoluble in water, meaning that it does not dissociate into ions and remains as AgCl(s) in water. On the other hand, NaCl is highly soluble in water, meaning that it dissociates into Na+ and Cl- ions when it dissolves in water.

Therefore, when NaCl dissolves in water, it forms more ions and contributes more to the increase in entropy of the system compared to AgCl.

Therefore, the entropy of 1.00 moles of AgCl added to 1.00 L of water to form AgCl(aq) would be less than the entropy of 1.00 moles of NaCl added to 1.00 L of water to form NaCl(aq), due to the difference in solubility and the resulting difference in the number of ions formed.

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If a chemical spill occurs in the lab, the best step to take is to quickly rinse the area with as much cool water as possible. A chemical spill can lead to harmful chemical exposure, and the best way to avoid exposure is to act fast and neutralize the spill.

Chemical spills can occur anywhere that hazardous chemicals are being used, but they are most common in industrial and laboratory settings. If you come across a chemical spill, it's important to act quickly and safely to prevent exposure. Here are the steps to follow in the event of a chemical spill:

Step 1: Assess the situation

The first step in handling a chemical spill is to assess the situation. Determine the type and quantity of the spilled material, as well as the potential hazards associated with it. This will help you determine the appropriate response.

Step 2: Evacuate the area

If the spill is large or the chemical is particularly dangerous, evacuate the area immediately. Alert others in the area to evacuate as well.

Step 3: Alert others

Once you have assessed the situation and determined the appropriate response, alert others in the area to the spill. Notify your instructor or supervisor and follow their instructions.

Step 4: Personal Protective Equipment (PPE)

When responding to a chemical spill, be sure to wear appropriate personal protective equipment (PPE), such as gloves, goggles, and lab coats.

Step 5: Use absorbent material

Use absorbent material, such as paper towels or absorbent socks, to contain the spill and prevent it from spreading. Once the spill is contained, dispose of the absorbent material according to your lab's waste disposal guidelines.

Step 6: Rinse the area with water

Quickly rinse the area with as much cool water as possible. This will help to neutralize the spill and prevent further damage.

Step 7: Use safety shower

If the spilled chemical comes in contact with your skin, use a safety shower to rinse off the chemical. Make sure to rinse thoroughly for at least 20 minutes.

Step 8: Dispose of contaminated materials

Dispose of contaminated materials according to your lab's waste disposal guidelines. Make sure to properly label all waste containers.

So, in a chemical spill the right thing to do will be 4. quickly rinse the area with as much cool water as possible

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When animals consume food containing large polymeric molecules, such as proteins, carbohydrates, and nucleic acids, their digestive system breaks down these molecules into smaller components that can be absorbed and utilized by the body.

Mechanical digestion occurs in the mouth and stomach, where food is broken down into smaller pieces through chewing and mixing with digestive enzymes and acids. Chemical digestion occurs primarily in the small intestine, where enzymes and other compounds break down complex molecules into smaller components.

Proteins, for example, are broken down into their constituent amino acids by proteases, while carbohydrates are broken down into simple sugars like glucose and fructose by amylases. Nucleic acids are broken down into nucleotides by nucleases.

Once these molecules are broken down, they are absorbed into the bloodstream through the walls of the small intestine and transported to the liver, where they are further metabolized and distributed to other parts of the body as needed. The body then uses these molecules to build new proteins, carbohydrates, and nucleic acids or to generate energy through cellular respiration. Any excess molecules are typically stored for later use or eliminated from the body as waste.

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--The complete question is, What happens to large polymeric molecules in food once they are eaten by animals?--

The correct answer is the option a) acidic. A solution at room temperature with a pH of less than 7 will be acidic.

Acids and bases are two types of chemical compounds that are important to human life. Acids are substances that have a pH of less than 7. They taste sour and, when mixed with a base, form a neutral substance. Acids are often used in industrial processes, such as cleaning or etching metals, as well as in medicine.

Bases are substances that have a pH of greater than 7. They taste bitter and have a slippery feel. When mixed with an acid, they form a neutral substance. Bases are commonly used in cleaning products and in the production of fertilizers and plastics.

A solution at room temperature with a pH of less than 7 will be acidic.

Therefore, the correct answer is (a) Acidic.

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The half-life of Polonium-210 is 417 days.

We know that the half-life of polonium is 139 days. This means that half of the original amount of polonium will disintegrate every 139 days. Now, suppose that the original amount of polonium is P0. After 139 days, half of the amount will be disintegrated. This means that the amount remaining is P0/2. Again, after another 139 days, half of the remaining amount will disintegrate. This means that the amount remaining will be P0/4. Similarly, after 3 half-lives, which is 3 x 139 = 417 days, the amount remaining will be:

P0/2³ = P0/8

This means that 7/8 of the original amount of polonium has disintegrated.

Therefore, 95% of the original amount has disintegrated after 139 days x (3 + 0.2)

half-lives = 417 days.

Therefore, the duration for which you will be able to use the polonium after the sample arrives is 417 days.

The question you wrote is incomplete, maybe the complete question is:

Polonium-210

The half-life of polonium is 139 days, but your sample will not be useful to you after 95% of the radioactive nuclei present on the day the sample arrives has disintegrated. For about how many days after the sample arrives will you be able to use the polonium?

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Answer:

22.414 [tex]dm^{3}[/tex] at S.T.P  and 24 [tex]dm^{3}[/tex]

Explanation:

Volume of one mole of gas at standard temperature and pressure, stp, (0 °C, 1 atm) is 22.4 dm3. At room temperature and average pressure, rtp, the volume of any gas is approximately 24 dm3.

The percent yield of isopentyl acetate is 71.23% when reacting 4.4 ml f acetic acid with 3.35 ml of isopentyl alcohol

Percentage yield can be defined as the ratio of the actual yield of a reaction to the theoretical yield of a reaction, multiplied by 100.

The percentage yield is calculated as follows:

Given data:

Volume of acetic acid used = 4.40 ml

Volume of isopentyl alcohol used = 3.35 ml

Volume of isopentyl acetate obtained = 3.25 ml

Density of acetic acid = 1.049 g/mL and its molar mass = 60.05 g/mol

Density of isopentyl alcohol = 0.809 g/mL and its molar mass = 88.15 g/mol

Density of isopentyl acetate = 0.876 g/mL and its molar mass = 130.19 g/mol

The balanced chemical equation for the reaction is:

C5H11OH + CH3COOH → CH3COOC5H11 + H2O

First, we need to determine which reactant is the limiting reactant. We can do this by calculating the number of moles of each reactant:

The mole ratio of acetic acid to isopentyl alcohol in the reaction is 1:1, so the limiting reactant is isopentyl alcohol because there are fewer moles of it.

The theoretical yield of isopentyl acetate can be calculated from the number of moles of limiting reactant:

Now we can calculate the percent yield:

The actual yield is given as 3.25 mL of isopentyl acetate, but we need to convert this to moles:

Therefore, the percent yield of isopentyl acetate is 71.23%.

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The reaction that best explains why adding a few drops of 1.0 M HCl(aq) does not significantly change the pH of the solution is HNO₂aq) + H₂O(l) ⇌ H₃O+(aq) + NO₂-(aq)

When HNO₂ and KNO₂ are mixed, they undergo a dissociation reaction in which HNO₂ donates a proton to water and forms H₃O+ and NO₂-. This reaction produces a weakly acidic solution with a pH of approximately 3. Adding a few drops of 1.0 M HCl to the solution would result in the protonation of NO₂- ions, forming HNO₂, which would lower the pH of the solution.

However, since HNO₂ is already present in the solution, the added HCl would not significantly change the pH of the solution. This is because the additional HNO₂ formed from the reaction of HCl with NO₂- would be in equilibrium with the original HNO₂ in the solution, and the concentration of HNO₂ would not significantly change.

Therefore, the equilibrium equation for the dissociation of HNO₂ in water can best explain why adding a few drops of HCl does not significantly change the pH of the solution.

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The mass of sodium chloride that is required to create a 0.875 M solution 534 g of water is 27.291 g and 0.467 moles of NaCl is required.

Mass of water = 534 g

Molality of the solution = 0.875 m

Molality is the number of moles of solute per kilogram of solvent.

It is represented by the formula:

Molality = number of moles of solute / kilogram solvent

Its mathematical expression is:

m = n/kg

Now we will convert the g into kg.

Mass of water = 534 g× 1kg/1000 g = 0.534 kg

putting the values in formula:

0.875 m = n / 0.534 kg

n = 0.467 mol

Now we will calculate the mass of sodium chloride:

Mass = number of moles × molar mass

Mass = 0.467 mol × 58.44 g/mol

Mass = 27.291 g

Thus, the required mass and moles of NaCl are 27.291g and 0.467mol respectively.

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If an isotope has a half-life of 4 billion years, then in 4 billion years, half of the original amount will still be present.

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons in the nucleus of an atom.

For example, carbon has two common isotopes: carbon-12 and carbon-14. Carbon-12 has six protons and six neutrons in its nucleus, whereas carbon-14 has six protons and eight neutrons.

Since the number of protons in an atom determines its chemical properties, isotopes of the same element have nearly identical chemical characteristics. Because isotopes have different numbers of neutrons, they have different atomic masses, but their physical and chemical properties are almost identical.

The half-life of a radioactive isotope is the amount of time it takes for half of the original quantity of the isotope to decay. Half-life is a critical consideration in nuclear medicine and radiology since it determines how long a radioactive substance will be active in the body before being completely eliminated.

The half-life of a given radioactive isotope is constant and cannot be altered by any external factors, such as temperature or pressure, which is a unique characteristic of radioactive decay.Isotopes can be found naturally or can be artificially made, and they can be radioactive or stable

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Possible orientations with which CO and O₂ can collide are: 8, and out of which orientations that can result in a successful reaction are: 4

CO-O2 Collision Orientations:

1. Linear - CO and O₂ are aligned in a straight line
2. Propeller - CO and O₂ are at 90° angle
3. Clapping - CO and O₂ move parallel to each other, 180° out of phase
4. Disrotatory - CO and O₂ move parallel, same phase
5. Conrotatory - CO and O₂ move parallel, opposite phase
6. Tumbling - CO and O₂ are at an angle and tumble in an elliptical path
7. Twisting - CO and O₂ at a 60° angle, move opposite to each other
8. Vibration - CO and O₂ oscillate

Successful Reactions:
1. Linear
2. Propeller
3. Clapping
4. Disrotatory

These four orientations can result in a successful reaction because the molecules are in the correct orientation for the electron orbitals to align, allowing for the electron transfer needed for the reaction to occur.

In conclusion, there are 8 possible orientations with which CO and O₂ can collide, and out of those 8, only 4 orientations result in a successful reaction.

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Answer: The concentration of Cr3 needed to achieve a cell potential of 0 V is 0.0310 M.

To calculate the concentration of Cr3 needed for the overall cell potential to be 0 V, you will need to use the Nernst equation. The equation is as follows: Ecell = E°cell - (2.303 RT/nF) * lnQ, where Ecell is the cell potential, E°cell is the standard cell potential, R is the gas constant, T is the temperature, n is the number of moles of electrons involved in the reaction, and F is the Faraday constant.

Given the information in the question, the concentration of Zn2 is 0.10 M, you can calculate the concentration of Cr3 needed to achieve a cell potential of 0 V:

Ecell = 0 V

E°cell = E°cell (given)

R = 8.314 J/K•mol

T = 298 K (room temperature)

n = 2 (number of moles of electrons involved)

F = 96485 C/mol

Substituting these values into the equation, you get: 0 = E°cell - (2.303 * 8.314 * 298/2*96485) * lnQ.

Solving for Q (the reaction quotient), you get

Q = (E°cell/2.303RT/nF)

= (1.1V/2.303 * 8.314 * 298/2*96485)

= 0.0310 M.

Therefore, the concentration of Cr3 needed to achieve a cell potential of 0 V is 0.0310 M.



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Answer : The freezing point of the solution is -0.746 °C.

Magnesium chloride is a common deicer used to melt snow on the road in winter.To find out the freezing point of the solution, we need to use the formula ΔTf = Kf × m where ΔTf is the freezing point depression, Kf is the freezing point depression constant, and m is the molality of the solution.

First, we need to find the molality of the solution. Molality is defined as the number of moles of solute per kilogram of solvent. The molar mass of magnesium chloride is 95.2 g/mol. Therefore, the number of moles of magnesium chloride in the solution is:

Number of moles of magnesium chloride = mass of magnesium chloride / molar mass of magnesium chloride
= 34.4 g / 95.2 g/mol
= 0.361 moles

The mass of water in the solution is 0.9 kg, which is equivalent to 900 g. Therefore, the molality of the solution is:
Molality = number of moles of solute / mass of solvent in kg
= 0.361 moles / 0.9 kg
= 0.401 m

The freezing point depression constant of water is 1.86 °C/m. Therefore, the freezing point depression of the solution is: ΔTf = Kf × m
= 1.86 °C/m × 0.401 m
= 0.746 °C

The freezing point of pure water is 0 °C. Therefore, the freezing point of the solution is: Freezing point of solution = freezing point of pure solvent − ΔTf
= 0 °C − 0.746 °C
= -0.746 °C

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No, the volume would not be different if the gas was argon under the same conditions as  two different gases that have the same number of moles, under the same conditions of temperature and pressure, would have the same volume.

"Explanation:In simple terms, the volume of a gas is proportional to the temperature, pressure, and number of particles (in moles) present. Therefore, under the same conditions of temperature, pressure, and number of particles, the volume of a gas will be the same, regardless of the identity of the gas.If the same number of moles of two different gases (such as nitrogen and argon) are present in the same container under the same temperature and pressure conditions, the volume of the two gases will be the same.In general, the volume of a gas is proportional to the number of moles of gas present in a container under constant temperature and pressure conditions. It follows that two different gases that have the same number of moles, under the same conditions of temperature and pressure, would have the same volume.

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Answer:

10.3 grams

Explanation:

The balanced equation shows that 1 mole of Cl2 reacts with 2 moles of NaBr. To find out how much Cl2 is required to react with 30 grams of NaBr, we need to convert grams to moles.

First, we need to find the molar mass of NaBr:

NaBr = 23 + 79.9 = 102.9 g/mol

Now we can calculate the number of moles of NaBr:

30 g NaBr ÷ 102.9 g/mol = 0.291 moles NaBr

From the balanced equation, we know that 1 mole of Cl2 reacts with 2 moles of NaBr. Therefore, we need half as many moles of Cl2 as we have moles of NaBr:

0.291 moles NaBr ÷ 2 = 0.1455 moles of Cl2

Finally, we can convert moles of Cl2 to grams using its molar mass:

Cl2 = 35.5 x 2 = 71 g/mol

0.1455 moles Cl2 x 71 g/mol = 10.3 grams of Cl2

Therefore, 10.3 grams of Cl2 are required to react completely with 30 grams of NaBr in this reaction.

The enthalpy change when 5 g of zinc metal is heated from 100oc to the point where the entire sample is melted having the heat of fusion for zinc is 112.4 j/g and its specific heat capacity is 0.388 is 581.4 J.

specific heat capacity is 0.388 j-1c-1 .

The specific heat capacity can be defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K.  

The heat of fusion for zinc is 112.4 j-1.

The expression for Heat energy is,

             = mcΔT+mL

where, m = mass of water

c = specific heat capacity of water

L = specific latent heat of fusion of ice

ΔT = change in temperature

Heat energy can be explained as a result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. It can be transferred from one object to another. The transfer or flow of heat energy due to the difference in temperature between the two objects is called heat.

Putting all the values in the expression of heat energy, we get,

  = 0.5 g * 0.388 * 100 + 5 * 112.4

  = 19.4 + 562

   = 581.4 J

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The weakest reducing agent from the given list of answer options is Pb2+.

A reducing agent is a substance that donates electrons, thus causing the reduction of another species. In other words, reducing agents are oxidized when they reduce another substance.

The stronger the reducing agent, the more readily it donates electrons, and the more likely it is to cause the reduction of another species. The weaker the reducing agent, the less readily it donates electrons, and the less likely it is to cause the reduction of another species.

To  determine the weakest reducing agent:

Pb2+: This species can act as a reducing agent, but it is not very strong. It has a standard reduction potential of -0.13 V.

This means that it is only a weak reducing agent.

However, it is not one of the answer options, so we can ignore it.

From this analysis, we can conclude that Pb2+ is the weakest reducing agent from the given list of answer options.

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